The United Planets of Earth (UPE) was the Human governing organization between 2523 and 2546. It was the reformed version of the United Nations of Earth. It was reformed in 2523, It ended with the foundation of the UEE and the beginning of the Messer Era.

The United Planets of Earth was created in response to the preferential treatment towards the Citizens of Earth by the United Nations of Earth. This was necessary because a majority of humans were living off Earth.

The congress was made of delegates representing the planets, unlike in the UPE where the Congress was made up of nations of Earth.

The UPE was responsible for an exploration boom through a venture known as Project FarStar, which resulted in the discoveries of numerous systems including Ellis, Orion and Terra. However, the project was scrapped after first contact with the Vanduul in 2681.